/Engine/Source/Runtime/CoreUObject/Public/UObject/LinkerLoad.h
Query method to help handle recursive behavior. When this returns true, this linker is in the middle of, or is about to call FinalizeBlueprint() (for a blueprint class somewhere in the current callstack). Needed when we get to finalizing a sub-class before we've finished finalizing its super (so we know we need to finish finalizing the super first).
True if FinalizeBlueprint() is currently being ran (or about to be ran) for an export (Blueprint) class.
bool IsBlueprintFinalizationPending() const